i think most people on here will tell you that the aluminum frame is killing you. While i agree, i think the 3x9 setup is also adding a good amount of weight (and EXACTLY where you don't want it, on the drivetrain). I don't know what will provide the best "bang for the buck", but i'd go with lightening the drivetrain (make it more efficient) before dropping the coin on a lighter frame.

In automotive drag racing, the common saying was 100lbs off you car will drop you 1/10th of a second. dropping 10lbs off your drivetrain will do the same. Given that you're riding 3x9 XT, i would look to go with a 2x9 XTR crank. Then worry about the frame.

Well go give you som inspiration. My 2003 Orange evo 2 with wheels that weight 2.3kg weighs in at 11.36kg. With the wheel I want (DT XR 350 rims, XTR hubs, Laser spokes and alloy nipples 1.4kg) and a carbon fork to replace my old worn out marzocchi's I will have a sub 10 kg bike. When I fit lighter pedals, a close ratio road cassette a DA rear mech, saddle change e.t.c. I am hoping for sub 9 kg and for it to be reliable.

Get an XT M785 or XTR M985 double chainset. If you can afford it get a XTR 98x rear mech but bolt tuning, fibre lyte carbon cages and carbon pullies on the current mech will shed a fair bit of weight. If your terrain allows move to a ultegra rad cassette and use a tuned ultegra of Dura ace rear mech.

Thumbies made up of DA bar end shifters and Paul thumbie adapters are very light and not too expensive. I am sing these and they work very well. Thumbies rule.

Carbon rigid fork will shed alot of weight.

You will have to spend though. My alu framed bike (frame is at least 1.7kg)

Searching online retailers, it seem there are lots of good deals on both SRAM and Shimano cranksets atm. It could certainly be a decent $ per gram saving compared with what you have now. I think there are also a few good deals on the older e.13 cranks and with good rings they are a fairly light set up. If you've still got stock rings, even just using a set of light double rings on your cranks now could provide good savings.

An Uno stem is probably lighter than what you've got now and can be tuned with Ti bolts. It's also very cheap.

Do you know the weight of your bars? You've already got a Mt Zoom seat clamp, they sell some of the lightest, cheap carbon bars.

Merek make a pretty good carbon 'post that's under 200 grams and has almost as much setback as the 'post you're currently using.

Also, just a clarification on some of what bm0p700f has said - Don't use thumb shifters if you want to use a Dynasys RD. You'd need to keep your Shimano 9 speed RD because the cable pull on a road RD is completely different from 10 speed MTB. If you did want to use thumbies and a 10 speed MTB RD, you'd need to use SRAM.

If you're thinking of changing to a double up front and have a clamp on FD, you could change to a road FD with carbon clamp and top pull adapter. That can be a really light setup, especially is you use a thumb shifter (even just for the FD only).

2x9 will save at most 90g compared to 3x9 (the only weight you save is the outer ring and by using slightly shorter bolts), 1x9 is the saving by loosing shifter and cable and front mech (gain a chain guide though).

Forks are overweight at 1900g, mine are 1450g.

As inspiration, my Carrera Kraken wighs in at 10.75Kg ish and the parts on the bike right now have cost me £400ish throuh judicious buying. (1450g forks, £55, 233g seatpost, £15 for example).

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